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A boat is being rowed away from a cliff ...

A boat is being rowed away from a cliff 150 meter high. At the top of the cliff the angle of depression of the boat changes from `60^(@)` to `45^(@)` in 2 minutes. Find the speed of the boat.

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The correct Answer is:
`=4500/sqrt(3)(sqrt(3)-1)` meters per hour.
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